Quantum spin dynamics of the antiferromagnetic linear chain in zero and nonzero magnetic field. Müller, G., Thomas, H., Beck, H., & Bonner, J. C. Physical Review B, 24(3):1429–1467, August, 1981.
Quantum spin dynamics of the antiferromagnetic linear chain in zero and nonzero magnetic field [link]Paper  doi  bibtex   

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